The common sense of sex

by James Oppenheim

"The common sense of sex by James Oppenheim" is a short work of popular psychology and sex education written in the early 20th century. It presents a clear, non-puritan view of sexuality, blending psychoanalytic ideas with practical guidance, and argues that sexual life is natural, varied, and best approached with informed common sense. The book surveys Freud’s account of infantile sexuality, fixation, perversion, and sublimation; contrasts it with Jung’s critiques, his introvert–extravert types, and the four functions (thinking, feeling, intuition, sensation) to show why sexuality differs so widely among individuals. It evaluates claims about a “third sex,” reframing them as mixtures of masculine and feminine principles present in everyone, and emphasizes Havelock Ellis’s “art of love,” where foreplay and mutual responsiveness elevate the act. The author warns against universal moral codes, explaining how fear, repression, mismating, and social pressures (fear of pregnancy, anxiety about impotence, rigid monogamy) distort desire, while misplaced creative energy can fuel perversions or crusading zeal. He urges sex education, compassionate guidance for youth (including handling auto-erotism), nuanced views on homosexuality and prostitution, and flexible, humane arrangements in adult relationships. It closes with an ideal of love that unites tenderness, passion, and respect, encouraging couples to find their own ethical way.